First of all, what is a computer virus? What is blackmail disease?

A computer virus is a set of computer instructions or program codes inserted into a computer program by a compiler, which is used to destroy computer functions or data, affect the use of computers, and replicate itself.

Computer viruses are contagious, hidden, contagious, latent, exciting, expressive or destructive. Life cycle of computer virus: development period → infection period → incubation period → attack period → discovery period → digestion period → extinction period.

A computer virus is a program, an executable code. Just like biological virus, it has the characteristics of self-replication, mutual infection and activation and regeneration. Computer virus has unique replication ability. They can spread quickly and are usually difficult to eradicate. They can attach themselves to various types of files, and when files are copied or transmitted from one user to another, they will spread with the files.

The ransomware (WannaCry) is a worm-like ransomware with a size of 3.3MB, which is spread by people using the leaked dangerous vulnerability "EternalBlue". The ransomware is as rampant as the global Internet disaster, causing huge losses to computer users. The latest statistics show that more than 654.38+million computers in more than 100 countries and regions have been attacked and infected by ransomware. Ransom virus is one of the most influential viruses after burning incense by grey pigeons and pandas. The global outbreak of WannaCry ransomware has attracted at least 150 countries and 300,000 users, resulting in a loss of $8 billion, affecting many industries such as finance, energy and medical care, and causing serious crisis management problems. Some domestic users of Windows operating system are infected, especially campus network users, and a large number of laboratory data and graduation projects are locked and encrypted. Some large enterprises' application systems and database files can't work normally after encryption, which has a great influence.